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At 65 mph it will take you approximately (b)100 feet.  

FPM speed

At 65 mph, keeping one second of subsequent distance means the vehicle is traveling 100 feet behind the vehicle in front. It takes an car a minimum of 150 feet to stop. With a 100 foot gap plus the auto's stopping distance of 150 feet, an impact would happen within 250 feet. In general, establishing a minimum following distance of six seconds is necessary.

These are in ideal conditions. Add one more second for each hazard present, such as rain.

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